<template>
  <div id="app" class="login_container">
      <div class="login_box">

          <!-- 头像区域 -->
          <div class="avatar_box">
              <img src="../assets/logo.png"/>
          </div>

          <!-- 表单区域-->
          <el-form label-width="0px" ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
              <!--用户名-->
            <el-form-item prop="username">
                <el-input prefix-icon="iconfont iconwode" v-model="loginForm.username"></el-input>
            </el-form-item>

            <!--密码-->
            <el-form-item prop="password">
                <el-input  prefix-icon="iconfont iconmima" v-model="loginForm.password" type="password"></el-input>
            </el-form-item>

            <!--按钮区域-->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
          </el-form>
      </div>
  </div>
</template>

<script>
    export default{
        data(){
            return {
                //这是登录表单的数据绑定对象
                loginForm:{
                    username:'admin',
                    password:'123456'
                },
                //表单的验证规则对象
                loginFormRules:{
                    //验证用户名是否合法
                    username:[
                        {required:true,message:"请输入登录名称",trigger:"blur"},
                        {min:3,max:5,message:"长度在3到5个字符",trigger:"blur"}
                    ],
                    //验证密码是否合法
                    password:[
                        {required:true,message:"请输入登录密码",trigger:"blur"},
                        {min:6,max:15,message:"长度在6到15个字符",trigger:"blur"}
                    ]
                }
            }
        },
        methods:{
            //点击重置按钮，重置登录表单
            resetLoginForm(){
                //console.log(this)
                this.$refs.loginFormRef.resetFields();
            },
            login(){
                this.$refs.loginFormRef.validate(async valid => {
                    if(!valid){
                        this.$message.error("验证不通过");
                        return;
                    }

                    //发起一个post的请求
                    // const {data:res} = await this.$http.post('login',this.loginForm);
                    // if(res.meta.status !== 200)
                    //     return  this.$message.error("登录失败");
                     this.$message.success("登录成功");

                     //1.将登录成功之后的token，保存到客户端的sessionStorage中
                     //1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
                     //1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                     //window.sessionStorage.setItem('token',res.data.token);
                     //2.通过编程式导航条转到后台主页，路由地址是/home
                     this.$router.push("/home");
                });
            }
        }
    }
</script>

<style lang="less" scoped>
    .login_container{
        background-color: #2b4b6b;
        height:100%;
    }

    .login_box{
        width:500px;
        height:300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left:50%;
        top:50%;
        transform:translate(-50%,-50%)
    }

    .avatar_box{
        height:120px;
        width:120px;
        border:1px solid #eee;
        border-radius: 50%;
        padding:10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left:50%;
        transform:translate(-50%,-50%);
        background-color: #fff;
        img{
            width:100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

    .btns{
        display:flex;
        justify-content:flex-end;
    }

    .login_form{
        position: absolute;
        bottom:0;
        width:100%;
        padding:0 20px;
        box-sizing: border-box;
    }
</style>
